Gaya APA

Douglas, E, J. (1995). Managerial economics: analysis and strategy (4th ed.). Singapore: Prentice Hall Simon & Schuster (Asia) Pte Ltd..

Gaya MLA

Douglas, Evan, J.. "Managerial economics: analysis and strategy". 4th ed. Singapore: Prentice Hall Simon & Schuster (Asia) Pte Ltd., 1995. Text.